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pub struct HashJoinTable<T: MemPool> {
    mem_pool: Arc<T>,
    c_key: ContainerKey,

    meta_page_id: PageId,
    meta_frame_id: AtomicU32,
    
    num_buckets: usize,
    bucket_entries: Vec<BucketEntry>, // Cache of (recent_page_id, history_page_id)
}